Open showcase

ABSTRACT

The invention is intended to provide an open showcase which allows efficient displaying of frozen and refrigerated foods even in a retail store with a limited sales floor space. Thus, the open showcase, as it comprises a lower showcase whose top face is open and an upper showcase which is arranged above and at a prescribed distance from the top face of the lower showcase, is enabled to display frozen foods in the lower showcase and refrigerated foods in the upper showcase. For instance, frozen foods such as ice cream and sherbet and refrigerated items such as custard pudding and yogurt can be displayed at the same time in a single showcase. Accordingly goods can be efficiently displayed even in a retail store having only a limited sales floor space.

BACKGROUND OF THE INVENTION

(i) Field of the Invention

The present invention relates to an open showcase to be installed in retail stores including supermarkets and convenience stores for the storage of frozen or refrigerated foods.

(ii) Description of the Related Art

Known conventional open showcases of this kind include one comprising a showcase body whose top side is open, an air duct formed along the front, bottom and rear sides of the showcase body, and a cooler and an air blower arranged within the air duct, in which an air curtain is formed in the opening of the top face by air sucked through an air intake disposed toward the front end of the showcase body, cooled by the cooler and discharged through an air outlet disposed toward the rear end of the opening of the top face of the showcase body. Frozen or refrigerated foods are preserved at low temperature in the showcase body.

However, according to the configuration of this conventional open showcase, where frozen foods such as ice cream and sherbet and refrigerated items such as custard pudding and yogurt are to be stored in a retail store space, a freezer showcase and a refrigerator showcase should be separately installed. In a retail store with a limited sales floor space, difficulty is very likely to be experienced in efficiently displaying such foods.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an open showcase which allows efficient displaying of both frozen and refrigerated foods even in a retail store with a limited sales floor space.

In order to achieve the object stated above, an open showcase according to the invention comprises a lower showcase whose top face is open, a cooler for cooling the inner space of the lower showcase, an upper showcase which is arranged above and at a distance from the top face of the lower showcase and whose front and rear faces are open, and another cooler for cooling the inner space of the upper showcase.

It is thereby enabled, for instance, to display frozen foods in the lower showcase and refrigerated foods in the upper showcase. In this case, since the upper showcase is arranged above the lower showcase, no extra installation space is required. Therefore, as it is possible to display frozen foods in the lower showcase and refrigerated foods in the upper showcase, frozen foods such as ice cream and sherbet and refrigerated items such as custard pudding and yogurt can be displayed at the same time in a single showcase for instance. Accordingly goods can be efficiently displayed even in a retail store having only a limited sales floor space.

Also in the foregoing configuration according to the invention, the lower showcase body may be provided with a machinery compartment to suck external air from the lower part of the front face of the lower showcase body and discharged from the lower part of the rear face, and forced draft unit may be further provided to cause air descending from the rear side opening of the upper showcase to circulate along the under face of the upper showcase toward the front of the lower showcase.

This makes it possible, in addition to the above-described effect, to prevent air on the upper showcase side from falling onto the top face of the lower showcase because the air descending from the rear side opening of the upper showcase is caused by the forced draft unit to circulate along the under face of the upper showcase toward the front of the lower showcase. Therefore, even where cold air having overflowed the air curtains formed on the upper showcase and external air cooled by contact with the air curtains descend toward the upper face of the lower showcase body, air on the upper showcase side does not fall onto the top face of the lower showcase. Therefore, disturbance of the air curtain of the lower showcase can be prevented without fail.

The aforementioned and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of an open showcase, which is a first preferred embodiment of the present invention;

FIG. 2 shows a front view of the open showcase;

FIG. 3 shows a side sectional view of the open showcase;

FIG. 4 shows a front view of an open showcase, which is a second preferred embodiment of the invention;

FIG. 5 shows a side sectional view of the open showcase;

FIG. 6 is a block diagram showing the control system of the open showcase;

FIG. 7 is a flow chart showing the operation of the open showcase;

FIG. 8 shows a side sectional view of the open showcase in which a duct is formed;

FIG. 9 shows a front view of an open showcase, which is a third preferred embodiment of the invention;

FIG. 10 shows a side sectional view of the open showcase;

FIG. 11 shows an open showcase with a built-in freezing machine having no forced draft unit disposed in the lower part of the upper showcase;

FIG. 12 shows an open showcase with a separate external freezing machine having no forced draft unit disposed in the lower part of the upper showcase;

FIG. 13 shows a side sectional view of an open showcase with a built-in freezing machine having temperature detectors in the vicinities of the lower showcase;

FIG. 14 shows a side sectional view of an open showcase with a separate external freezing machine having temperature detectors in the vicinities of the lower showcase;

FIG. 15 shows a side sectional view of an open showcase with a built-in freezing machine having air velocity detectors in the vicinities of the lower showcase; and

FIG. 16 shows a side sectional view of an open showcase with a separate external freezing machine having air velocity detectors in the vicinities of the lower showcase.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 through FIG. 3 show a first preferred embodiment of the present invention.

This open showcase comprises a lower showcase 10 whose top face is open, and an upper showcase 20 which is arranged above and at a distance from the top face of the lower showcase 10 and whose front and rear faces are open.

The lower showcase 10 is provided with a lower showcase body 11 whose front, right, left, rear and bottom sides are surrounded by thermally insulating walls, an air duct 11 a formed along the front, rear and bottom sides within the lower showcase body 11, an air blower 11 b and a cooler 11 c arranged within the air duct 11 a, an intake 11 d disposed toward the front end of the opening in the top face of the lower showcase body 11, and a blow-off port 11 e disposed toward the rear end of the opening in the top face of the lower showcase body 11.

A machinery compartment 12 is disposed in the lower part of the lower showcase body 11, and a condenser 12 a, a condenser cooling blower 12 b and a compressor 12 c are housed in the machinery compartment 12. An intake 12 d to suck external air is disposed in the lower part of the front face of the lower showcase 10, and an outlet 12 e to discharge air is disposed in the lower part of the rear face of the machinery compartment 12.

The upper showcase 20 is configured of an upper showcase body 21 to mount foods on, a pair of right and left supporting members 22 to support the upper showcase body 21, a current plate 23 constituting the central part of the top face of the upper showcase 20, and a pair of side plates 24 arranged on the right and left sides of the upper showcase body 21.

The upper showcase body 21, whose bottom side is formed of a thermally insulating wall, is built smaller than the lower showcase 10 in the front-to-rear dimension. The upper showcase body 21 is provided with an air duct 21 a formed along the bottom side within the upper showcase body 21, a pair of coolers 21 b, of which one each is arranged on the front and rear sides within the air duct 21 a, an air blower 21 c arranged between the front side cooler 21 b and the rear side cooler 21 b, a pair of intakes 21 d disposed toward the lower ends of the front and rear side openings, a blow-off port 21 e disposed at the center in the lengthwise direction, and a transparent resin-made partitioning plate 21 f dividing the blow-off port 21 e in the lengthwise direction.

The under face of the upper showcase body 21 is inclined toward the center from the front and rear faces so that foods in the lower showcase 10 can be easily taken out. Fluorescent lamps 21 g to illuminate the lower showcase 10 from above, extending in the widthwise direction, are arranged at the lower end of the upper showcase body 21.

Each of the supporting members 22 extends upward from the upper end of the right or left side of the lower showcase body 11, and supports the right or left end of the upper showcase body 21.

The current plate 23 is so formed as to extend in the widthwise direction of the lower showcase 20, and its two ends in the lengthwise direction are bent obliquely downward. At the center in the lengthwise direction of the under face of the current plate 23, a fluorescent lamp 23 a is arranged extending in the widthwise direction. The fluorescent lamp 23 a is shielded by an illumination cover 23 b whose section has an inverted triangular shape.

Each of the side plates 24 is formed of a glass sheet extending upward from the right or left side of the lower showcase body 11, and the plates shield all of the upper showcase body 21 and the current plate 23 from the right and left sides.

In the open showcase configured as described above, air sucked by the air blower 11 b of the lower showcase 10 through the intake 11 d flows into the air duct 11 a and, after being cooled by the cooler 11 c, is discharged through the blow-off port 11 e. This causes cooled air to flow from the rear side to the front side of the opening of the top face of the lower showcase 10 to constitute an air curtain A.

In the upper showcase 20, air sucked by the air blower 21 c through the intakes 21 d flows into the air duct 21 a and, after being cooled by the coolers 21 b, is divided by the partitioning plate 21 f into the forward and backward directions and blown out upward from the blow-off port 21 e. The air currents blown upward flow along the illumination cover 23 b fitted to the under face of the current plate 23 and the under face of the current plate 23, and air curtains B are formed from the upper end toward the lower end of the front and rear openings.

In the open showcase embodying the invention in this mode, it comprises the lower showcase 10 whose top face is open and the upper showcase 20 arranged above and at a distance from the top face of the lower showcase 10. Therefore, it allows displaying of refrigerated foods in the upper showcase 20 while displaying frozen foods in the lower showcase 10. For instance, while frozen foods such as ice cream and sherbet and refrigerated items such as custard pudding and yogurt can be displayed at the same time in a single showcase, and accordingly goods can be efficiently stored even in a retail store having only a limited sales floor space.

Also, the effectiveness of product display and service convenience can be enhanced without sacrificing the visibility and access to goods in the lower showcase 10, as the upper showcase 20 is supported by the supporting members 22 extending upward from the upper ends of the right and left sides of the lower showcase 10.

Further, the space within the upper showcase 20 can be uniformly cooled because air sucked through the intakes 21 d, disposed toward the lower ends of the openings in the front and rear faces of the upper showcase 20, into the air duct 21 a is cooled by the coolers 21 b and, after being discharged upward through the blow-off port 21 e disposed at the center in the lengthwise direction of the upper showcase body 21, is caused to circulate in the lengthwise direction along the under face of the current plate 23.

Also, the installation space of the air blower 21 c can be reduced and the upper showcase 20 made more compact, as the coolers 21 b are disposed on the front and rear sides of the upper showcase 20 and the air blower 21 c are arranged between the coolers 21 b.

Further, as the space in the upper showcase body 21 is divided into the front and rear parts by the partitioning plate 21 f, it is possible to divide the air discharged from the blow-off port 21 e into a forward flow and a backward flow, and therefore to prevent air discharged from an air-conditioner or the like, for instance, within the store from disturbing the air in the upper showcase body 21.

The presence of the fluorescent lamp 23 a on the under face of the current plate 23 makes it possible to brightly illuminate foods arranged in the upper showcase 20 and thereby enhance the displaying effect.

The use of the illumination cover 23 b having an inverted triangular-shaped section to shield the fluorescent lamp 23 a makes it possible to guide the discharged air along the illumination cover 23 b toward the front and rear sides and thereby to ensure smooth air circulation without disturbing the air in the upper showcase 20.

FIG. 4 through FIG. 7 show a second preferred embodiment of the present invention. Equivalent constituent elements to their counter parts in the first preferred embodiment are denoted by respectively the same reference signs.

In the first embodiment, as shown in FIG. 11, there may occasionally occur a case in which cold air having overflowed air curtains B formed in the upper showcase 20 and external air cooled by contact with the air curtains B descend from the upper showcase 20, and these air flows C are induced by the air blown behind the machinery compartment 12 to cause the air curtain A of the lower showcase 10 to be disturbed by its contact with the airflows C. In view of this problem, the open showcase of this second embodiment has air blowers 30, the counterpart of which in the open showcase of the first embodiment is disposed on the under face of the upper showcase 20, and a control unit 40 for controlling the air flow rate of the air blowers 30.

A plurality of the air blowers 30 are arranged at prescribed intervals in the widthwise direction at the lower end of the upper showcase body 21, and underneath them there are arranged the fluorescent lamps 21 g, extending in the widthwise direction, to illuminate the lower showcase 10 from above.

The control unit 40, consisting of a microcomputer, is connected to the air blower 30 and a temperature detector 41 disposed within the air duct 11 a of the lower showcase 10.

In this open showcase, cold air having overflowed the air curtains B of the front and rear faces of the upper showcase 20 and external air cooled by contact with the air curtains B descend along the under face of the upper showcase body 21. These descending air flows C are caused by the air blower 30 to circulate toward the front side of the lower showcase 10 and sucked into the intake 12 d of the machinery compartment 12.

Next, the operation of the control unit 40 will be described with reference to the flow chart of FIG. 7.

First, when the temperature in the air duct 11 a of the lower showcase 10 is at or above a prescribed set temperature T1 (S1), the air flow rate of the air blower 30 is set to its maximum (S2). Or when the temperature in the air duct 11 a is below the prescribed set temperature T1 (S1) and at a prescribed set temperature T2 (S3) or lower, the air flow rate of the air blower 30 is set to its minimum (S4). Or when the temperature in the air duct 11 a is below the prescribed set temperature T1 (S1) but higher than the prescribed set temperature T2 (S3), the air flow rate of the air blower 30 is set to a prescribed medium rate between the maximum and the minimum (S5).

As described above, in the open showcase of this embodiment, the air flows C descending from the opening in the rear face of the upper showcase 20 are caused to circulate toward the front side of the lower showcase 10. Therefore, air on the upper showcase 20 does not descend onto the top face of the lower showcase 10, thereby making it possible to prevent the air curtain A of the lower showcase 10 from being disturbed without fail. Moreover, as the air flows C descending from the upper showcase 20 can be used for cooling the condenser 12 a, the efficiency of cooling can be enhanced.

There are further provided the temperature detector 41 for detecting the temperature in the lower showcase 10 and the control unit 40 for controlling the air flow rate of the air blower 30 on the basis of temperatures detected by the temperature detector 41. As the air flow rate is thereby increased when the detected temperature is high, or reduced when the detected temperature is low, the optimum air flow can be formed all the time, unaffected by any change in the environment in which the open showcase is installed or by any like factor.

Although air on the under face side of the upper showcase 20 is caused to flow only by the air blowers 30 in the embodiment described here, it is also conceivable to form a duct 31 on the under face of the upper showcase 20 as shown in FIG. 8 and to arrange the air blowers 30 within the duct 31. In this case, as it is possible to have the air flows C descending from the upper showcase 20 sucked into the duct 31 and discharged forward, the air flow in the lengthwise direction along the under face of the upper showcase 20 can be smoothly formed by the duct 31, and the descent of air to the air curtain A of the lower showcase 10 can be prevented without fail.

Although an axial blower is used as the air blower 30 in the second embodiment described above, a Silocco fan, a line flow fan or the like can be used as well.

FIG. 9 and FIG. 10 show a third preferred embodiment of the present invention. Equivalent constituent elements to their counter parts in the first preferred embodiment are denoted by respectively the same reference signs.

The open showcase of this embodiment has no freezing equipment built into it, but is connected by copper piping to external freezing equipment (not shown). In such an arrangement, the air flows C descending from the air curtains B may fall on the top face of the lower showcase 10 and disturb the air curtain A as shown in FIG. 12. To cope with this problem, the forced draft unit of this embodiment comprises a duct 32, so formed on the under face of the upper showcase 20 as to blow air in the front and rear directions, and an air blower 33 arranged within the duct 32.

In this open showcase, external air is taken in by the air blower 33, and blown on the front and rear faces via the duct 32 on the under face of the upper showcase 20. This arrangement causes the air flows C descending from the air curtains B to go down, together with the air blown out of the duct 32, onto the front and rear faces of the lower showcase 10 instead of falling onto the top face of the lower showcase 10 from the under side of the upper showcase 20.

In the open showcase of this embodiment, air is blown from the under face of the upper showcase 20 toward the front and rear faces of the lower showcase against the air flows C descending from the openings of the upper showcase 20. Therefore, the air flows C descending from the upper showcase 20 are obstructed from falling onto the top face of the lower showcase 10, and the disturbance of the air curtain A of the lower showcase 10 can be prevented without fail.

Further, as the forced draft unit is configured of the duct 32 and the air blower 33 by which air is blown from the under face of the upper showcase 20 toward the front and rear faces of the lower showcase against the air flows C descending from the openings of the upper showcase 20, the air flows C descending from the upper showcase 20 are obstructed from falling onto the top face of the lower showcase 10, and the disturbance of the air curtain A of the lower showcase 10 can be prevented without fail.

The temperature detector 41 is installed within the air duct 11 a of the lower showcase 10 for the control of the air blowers 30 or 33 in the second and third embodiments described and illustrated above. Instead, in an open showcase with a built-in freezing machine, temperature detectors 41 may be disposed in the vicinities of the openings in the front and rear faces of the lower showcase 10 to detect air flowing out of the lower showcase 10 with the temperature detectors 41 and to control the air flow rate of the air blower 30 according to the detected temperature as shown in FIG. 13. Similarly, in an open showcase having no built-in freezing machine as well, temperature detectors 41 may be disposed in the vicinities of the openings in the front and rear faces of the lower showcase 10 for use in controlling the air blower 33 as shown in FIG. 14. It is also conceivable to dispose a damper within the duct 32, or provide a plurality of air blowers facing forward and backward and to separately control the forward and backward air flow rates.

Another conceivable arrangement is to dispose air velocity detectors 42 in the vicinities of the lower showcase 10 as shown in FIG. 15 and FIG. 16 to detect the velocities of air flowing out of the openings in the lower showcase 10 and control the air blower 30 or 33 on that basis. In this case, known sensors such as hot-wire anemometers can be used as the air velocity detectors 42.

Further, though not shown, temperature detectors 41 and air velocity detectors 42 may be disposed in the vicinities of the lower showcase 10 to detect the temperatures and flow velocities of air flowing out of the openings in the lower showcase 10 and to control and the air blowers 30 or 33 on that basis.

The preferred embodiments described in this specification are only for the illustrative purpose but not intended to limit the scope. The scope of the present invention is stated in the appended claims, and all the modifications that can be covered by the meaning of the claims are included in the invention. 

1. An open showcase comprising: a lower showcase whose top face is open, a cooler for cooling the inner space of the lower showcase, an upper showcase which is arranged above and at a distance from the top face of the lower showcase and whose front and rear faces are open, and a cooler for cooling the inner space of the upper showcase.
 2. The open showcase according to claim 1, wherein: said lower showcase comprises a lower showcase body, an air duct formed along the front, rear and bottom sides of the lower showcase body, and an air blower arranged together with a cooler within the air duct; and air sucked through one end in the lengthwise direction of the opening in the top face of the lower showcase into the air duct is cooled by the cooler, and the air cooled by the cooler is discharged toward that one end in the lengthwise direction of the opening in the top face from the other end.
 3. The open showcase according to claim 1, wherein: said upper showcase is supported by a pair of supporting members extending upward from the right and left sides of the lower showcase.
 4. The open showcase according to claim 1, wherein: said upper showcase comprises an upper showcase body, an air duct formed along the bottom side of the upper showcase body, an air blower arranged together with said cooler within the air duct, and a current plate disposed in the central part in the lengthwise direction of the top face side of the upper showcase body; and air sucked through the lower end sides of the front side opening and the rear side opening of the upper showcase body into the air duct is cooled by the cooler and discharged upward from the central part in the lengthwise direction of the air duct, and at the same time is divided by the current plate toward the forward and backward faces of the upper showcase body.
 5. The open showcase according to claim 4, wherein: the air blower of the upper showcase is arranged the central part in the lengthwise direction of the air duct, and one each of said cooler is disposed before and behind the air blower.
 6. The open showcase according to claim 4, wherein: a partitioning plate to divide the space inside said upper showcase body in the lengthwise direction is provided, and air discharged from an air blow-off port is caused to circulate upward along the front and rear faces of the partitioning plate.
 7. The open showcase according to claim 5, wherein: a partitioning plate to divide the space inside said upper showcase body in the lengthwise direction is provided, and air discharged from an air blow-off port is caused to circulate upward along the front and rear faces of the partitioning plate.
 8. The open showcase according to claim 4, wherein: an illuminating device is disposed on the under face in the central part in the lengthwise direction of said current plate.
 9. The open showcase according to claim 8, wherein: said illuminating device is provided with an illumination cover whose front and rear faces are inclined obliquely upward.
 10. The open showcase according to claim 1, wherein: the lower showcase body is provided with a machinery compartment to suck external air from the lower part of the front face of said lower showcase body and discharge from the lower part of the rear face, and a forced draft unit to cause air descending from the rear side opening of said upper showcase to circulate along the under face of the upper showcase toward the front of the lower showcase.
 11. The open showcase according to claim 10, wherein: said forced draft unit comprises a duct to blow air sucked from the rear side of the upper showcase toward the front side, and an air blower arranged within the duct.
 12. The open showcase according to claim 1, further provided with: a forced draft unit which blows air from the under face of the upper showcase toward the front and rear sides of the lower showcase against air flows descending from the front and rear openings of said upper showcase.
 13. The open showcase according to claim 12, wherein: said forced draft unit comprises a duct to blow air toward the front and rear sides of the upper showcase and an air blower arranged within the duct.
 14. The open showcase according to claim 10, further provided with: a temperature detector for detecting the temperature within the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of temperatures detected by the temperature detector.
 15. The open showcase according to claim 12, further provided with: a temperature detector for detecting the temperature within the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of temperatures detected by the temperature detector.
 16. The open showcase according to claim 10, further provided with: temperature detector for detecting the temperature in the vicinities of the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of temperatures detected by the temperature detector.
 17. The open showcase according to claim 12, further provided with: a temperature detector for detecting the temperature in the vicinities of the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of temperatures detected by the temperature detector.
 18. The open showcase according to claim 10, further provided with: an air velocity detector for detecting the velocities of air flowing out of the openings in the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of the air velocities detected by the air velocity detector.
 19. The open showcase according to claim 12, further provided with: an air velocity detector for detecting the velocities of air flowing out of the openings in the lower showcase, and a control unit for controlling the air flow rate of said forced draft unit on the basis of the air velocities detected by the air velocity detector. 